The M103 has 166,000mi. I only use Mobil 1 grade of 15W50. Sound comes from very front of engine. Yesterday, the sound is not only on startup now. It is like an intermittent rattling. However, the tapping on startup does not happen anymore. I guess I should not run this engine until chain/tensioner/guides can be checked. Can it be driven to the mechanic or should I tow?

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ARVY

1999 E430
1999 C230 Kompressor
1992 300E (write-off)
1984 190D 2.2 (sold)